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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '133ab0255f743e6b9d381041961201806fcdaf6cd520f668bb08c708bfdafe17' 
  AND token = 'yA6rKg29koBg3N1pUfXBbnTJsvUts7IUGFRSx8/OIUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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