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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7136282067b267992291eb57082638ec7f9e3b6f51ca3e8f58466e23e4a9995d' 
  AND token = 'fSk0EwNFYunseXuExHPgt/qr7ucxkD+cTeiOUVekUHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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