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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9d20fa9741906045913b84d6728df1f24d892409744a313bd328879369f8184' 
  AND token = '62wi+zxH4y/KefL2rDaw7khLVM+LMieanxw9WBa85SU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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