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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10d047e1e76902d4d1d712dd7a5cc286c10626c307adb372c646ded9782061d8' 
  AND token = 'qC4Saeqn1c4a9kb8aJqvd7/gjSKkeK3CeQ4u9rZqbUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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