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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f5a99614c1e4e464fab1cc35239d8c42224428b0dd44770ddc1eabd8875c66' 
  AND token = 'BkMZHtqRW3qj5jHYChSOHiqcOK99hap2iOwDDI90Eu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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