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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f60bac23204b90f09c046abe614230407dc75132a789a0f6ff298d25b09d94d5' 
  AND token = 'o8PPmV/SvRlZRz27MCNAS0bjeudO/2g7JQliIS5w11g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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