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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '110aa4db4c3f2bf4c81fa42465595bfe826a156fd61ed37d2750acc72e40c5bf' 
  AND token = 'ly6JjcqJurWFQHdafbwY77cZNWFGRWMGXP5Lh79J7Uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}