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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0d96d5deb40f0011ff3a7851c521f243010e2920dd86e5166fa3e9355ae958d' 
  AND token = 'rBxx4HO0657Z+B4H7ycQCO4dw8IU8hlfUQoLe5DyI6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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