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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09254883c7563fcbb0604746e4ab696f9f8765d4c099d7771707b0d032ebfb24' 
  AND token = 'sFrbm192PCAp3I000LWN7PKfhfEZ2Q6IZ+2OQsV7M4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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