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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52e1c0a7a8cb5028d863ccfb1b8f8f4e01552554f7dbb568d33834a03fcfeca7' 
  AND token = 'F7ZnNeXhB415lsEyXw9g424tZx04Ovc51DOpl+65Gs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00077

JSON explain

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