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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6d4e869c3fbc02ec69ed7bd399d7c3d339f8f3b58de2bf2036d66a2b8a532ef' 
  AND token = 'sD8RZHKvW5UaIFvzWU1OpLmLvDSEIpgIVAUIFJ9JPCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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