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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7bee98d8c7c2ac4eee57d05da2b7303dc57671e8ddd8d791341e6d2e71c19c' 
  AND token = 'Cu+2+aV5g+dCjOx3pDmZth0vcqBdS/w0xUrbXkqLEXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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