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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2f263db8e57753910a7c038b4d49f73446e6ab747400c37015390426145c3e3' 
  AND token = 'vO9EMpx8x09gC+CUJcdJfWJGDJCDVt8Ld6wwivGy8U0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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