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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd37b84bcdb90a3132babcac00b4422a41cc7e9292cdc624039db768d829620b4' 
  AND token = '4EWp0K24AILhFV0DfdRZ2NOag73N+hjvjysyYGV9OrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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