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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f97e984104ed32b03bf603eaca4413ad1918fef3caa79bb5c1f6c77dd5974a9' 
  AND token = '7EaXGft3EAgU74JQLPWELdQPTv5BcA5J1cR04rM6Brc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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