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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5936c2b8d5d561b100fdaeb72b8881c17554bf5f45a44e71fb87a0d4d3d92e7e' 
  AND token = 'RIS4AFeDMlhqBQgAmLdixEHgJcmx20Ky9/onLi8m91g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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