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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96e25f29038c5ddc77adac0e004379ff681b0f074b286514838ea4bddaa8a7d0' 
  AND token = 'FGx+DRqBPrLlDB6KLAd+7VV0+ZlFiY7O0ZMxApHinw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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