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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dce0b7252263957836d3e65e5b9d87a074c3a4bd813271aa7fa9f08e375b3136' 
  AND token = 'BGs1agGIE3I4kkCHZXcgyI/Or91SQIVh6O7deXdAShA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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