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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5ff2bffcf8bdb319e8f276c5880399a8431c50c348737ccc0d3e4e85a9c2d53' 
  AND token = '+8MxUAkEeiHhmDCysOjvwMBHvn80T7pTOfJD3j+jxZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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