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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2eac86892f43b4088d04c19bab34509146b5cef61375ac10c6e7c70865105f51' 
  AND token = '9NsbKnRfJNxPFFH5Mztq2br6DJMlzxbnfzQLwrVC9W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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