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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0a8da87523896a3c926b320501b2876fae0b6415763fbc001bcf12a6a052993' 
  AND token = 'DPkBKl1D3H4EPo12+fMD6E1tB8cyVRPYEEqePKcOWgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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