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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9002f5f2e7f7949b0238629eb71fa3906254967277faa5de69b6d0d11525e79' 
  AND token = 'BsHCogJ/7KD/r+E4R2ygFSeNDI26HrPtV8foDzGTwNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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