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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59d566e8f8cdf9b2abacf8aec26cec526a6e0a534d0b0a00479b4d9fd43b0b24' 
  AND token = '5iUOWZBoNYBBoA8y0C/QCSUHp9Po9cuoIhszR5k0Tzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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