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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af19746c71b2199c83d00d4e94abcc47fcf44824297ffafd8e385ed78c5333d1' 
  AND token = 'xh8TGVwFaUZsPMZ74+X+q/1bL/DPbWQ+qGP9pbXakWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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