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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c98a029b3cb0de29267a708d0d3946a806bcf666b86db6eddb0114374813fcad' 
  AND token = 'yeRo7kHWZgzpOBdzh47cAEr3+A4vCfHzIxm1UNbkIUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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