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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35bcd7c507f0e2a010c49fcf10b14a1a2b32c1faf72533ef9edfa10c7e8f7594' 
  AND token = 'HAZB4bntWQYuR7ftn/S96SoPFJUYIHFn179ZMIH7RDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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