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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c913cd97229958508a299f10976e6e8129a7ac3ee14472e11d6051478ec8cb11' 
  AND token = 'M1Yr/Efsl812J3Z7xIU8uO8VyLu8dyvl5nz/YynlnZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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