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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44bfe7cac894d1c93954313fb113a815ab1ab232e8a43d4d20df93eccb85ad35' 
  AND token = 'OXMKp+S2TlK4P0t5MyXDzE/sC4sVg0ptPH6qwqJWED8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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