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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6945e66c04190df856698ccc287c674790146b8428210419cd1ef9651a0101a3' 
  AND token = 'iFoYe4S2nQulYVi2A9elzzlQ7qpE7SMlzUQ/t+dCYP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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