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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a1d32a009e593d87286da8150b310c909ce6e7630871a5267d4aa9478dbde7f' 
  AND token = 'T+M3PFSoLrmG0Y9pyNTrEJEqpLbxBY30N+ZXZnQus9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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