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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f980c1938db8d9a213fda31d0b2feea2ce364dd248104ed600eee4c1fec34db' 
  AND token = 'zCSCV0B9Zh+p30mhn4W0Ox5n9ct1IZnFMzWKAbV7PyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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