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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e1ac99ffb2d8b751a50a2768cd56a539bd594a8100a213ad88c3398f8655912' 
  AND token = '91ZtEehIvrvbZdsgh1OQGu6nrM4YPdmkYvjXo3aB5h4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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