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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7977895a4b78a9d8a6ac5c5f101e61305da2e1a52dedf7ff7dd0b245e9d95a84' 
  AND token = 'k/R3DjC1A7hvCVPpRBibJF6K86V3/MTMKnvkS8sGpAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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