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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b47f24cd82c93eeafabb97a0107445f1e3b63d208e555bd8f9bd5da14364a82' 
  AND token = 'C53ny+QErJG0+ukeRtXOFdce9cZjEMr5H/3JVJOJYIM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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