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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '802eaa7c9a77425463f2417fa8e100cb99b5262ecc8a6e7b5e06d5c08928bf12' 
  AND token = 'rTfj+oREnlynxO6NVvUbXYTflGyFS9426dOVXbszXR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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