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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf19abc1a8db187be5630412edcaae77b6b5f74b2009b4fbc4b76fd9092ada4e' 
  AND token = 'fHiSKe6uhk2e3ghFfCk3rNID5zVC2MMDFnGLPogujrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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