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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ba66c5c171011f09695f16d08059382036ac35f2cc4404392c855834859908c' 
  AND token = 'cRWvHRS+NtAviMpLgT7p4Fl2+ittkGESht3+4FaMxtA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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