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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f17664c9d008054c432914537ca9187481bfb5066d69e46c88d060095e484ed' 
  AND token = 't8kPqZECt13uKnoDAKhLRc8lTQ/pQ6Y9TWXbSS21qEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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