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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4200b5dcf84bb8d2de2fcda3a261bd5a33a8e0142ba094b452d1970cc1b803' 
  AND token = 'NE1JktvOY7q8pm1Q8bZQp89whacty96MDURaMsNjo7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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