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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92622bc62a4c69d96f63360430125287e931c2597d211eff9d598accce41faa6' 
  AND token = 'spn9exwmV+mqzmRQeDEGnQqo4Sffeb/M4u1ExUHJ4Y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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