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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fe1d0091b1d4989f959677c81f47355c6fd6dd077d37ba6f481b175c504674' 
  AND token = 'T6+eXDamTIT1EtfFjCx2jShbk0mYQrGwt5eh0ma1/DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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