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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982b266f3b652bd098ff0a66a36307dc53d444b0e35a00604ff5d69d4e08870e' 
  AND token = 'LDhQozilJzcvsJltH8m5UFyqRqMbF2nHPAn5EQ+Ytcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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