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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37d86707299399edd598d8df6d6d82a6a429cc35d2fa0d2a4e600257e919b5a' 
  AND token = 'dU5cAOKj+2CJv9Urs6Vs8/iEvT+aGyis797R+MmRZH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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