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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8e030f220812594b3c6d5fb7e7a1bc9c6699c4cf9c5f34adafa81365401c139' 
  AND token = 'sNMdsHq4oJvS6yQX+USj/SnsEm39KLte6c7ZCmmOQb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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