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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10d5aa4fb11a5534011a93d057b2d6db1c45927196e82b2658f662277168d48' 
  AND token = 'zgropcbKyTzxlL02e4wNix2JX+QZUkvG2MilrdQh7Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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