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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5902886be5cc458ce11255a15f6ca2d898b0fb5c0d27d70c19d83f9ac8e61ec0' 
  AND token = 'HhMhU3WrpDCCvBtycl+5sBie7wMY37iwsM3aNNBTys8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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