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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a2ffbac02a4f112c3a1e84254da2aeea43e51b0746e94dfdd332a4e020db505' 
  AND token = 'hT0m//X9Z1eG1FsjdgSfj8sBJT7UnB1F+baSGnDZ1kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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