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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b09838a4722cfd68dff18553c485f6f9816e73b04be2140017110d3705dd56ae' 
  AND token = '2X9NvKd8QYHkj2ySnEMwiZRV5EBWYi4bnQWYIRWx4kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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