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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eebdd8def5e6c89d5b5355cd12e106493c72e677a242fb8bce440489ad9fa58' 
  AND token = 'LvCYCxn5ngVHQaDwvpFELtMVnXx7Ao5Wbe/DosSvVTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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